PCA9546ADT

Product Overview

• Category: Integrated Circuit
• Use: I2C Multiplexer
• Characteristics:
  • Allows multiple I2C devices to share a single I2C bus
  • Provides bidirectional voltage-level translation between different I2C buses
  • Supports hot insertion
• Package: TSSOP-24
• Essence: The PCA9546ADT is a multiplexer that enables communication between multiple I2C devices using a single I2C bus. It also provides voltage-level translation between different I2C buses, allowing devices operating at different voltage levels to communicate seamlessly.
• Packaging/Quantity: The PCA9546ADT is available in a TSSOP-24 package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Compatibility: Standard-mode, Fast-mode, Fast-mode Plus, and High-speed mode
• Number of Channels: 4
• Channel Switching Time: 1.5μs (maximum)
• Standby Current: 1μA (maximum)

Pin Configuration

The PCA9546ADT has a total of 24 pins arranged as follows:

```

---

| | | PCA9546ADT | |_______________________________________|

     Pin Configuration (TSSOP-24)

1   NC       13  SDA1
2   GND      14  SCL1
3   SDA0     15  SDA2
4   SCL0     16  SCL2
5   EN       17  SDA3
6   A0       18  SCL3
7   A1       19  NC
8   A2       20  GND
9   VCC      21  NC

10 SDA4 22 SCL4 11 SCL4 23 NC 12 SDA5 24 NC ```

Functional Features

• Allows multiple I2C devices to be connected to a single I2C bus, reducing the number of required I2C interfaces.
• Provides voltage-level translation between different I2C buses, enabling communication between devices operating at different voltage levels.
• Supports hot insertion, allowing devices to be added or removed from the bus without disrupting the communication between other devices.
• Low standby current consumption ensures minimal power consumption when not actively switching channels.

Advantages and Disadvantages

Advantages

• Simplifies I2C bus design by reducing the number of required interfaces.
• Enables communication between devices operating at different voltage levels.
• Supports hot insertion, providing flexibility in system configuration.
• Low standby current consumption helps minimize power consumption.

Disadvantages

• Limited to 4 channels, which may not be sufficient for applications requiring a larger number of I2C devices.
• Requires careful consideration of bus capacitance and pull-up resistor values to ensure proper operation.

Working Principles

The PCA9546ADT operates as an I2C multiplexer by selectively connecting one of its four input channels to the output channel. The selection is controlled through the I2C bus by writing to the appropriate control register. When a channel is selected, the corresponding SDA and SCL lines are connected to the output, allowing communication with the desired device. The device also provides bidirectional voltage-level translation between different I2C buses, ensuring compatibility between devices operating at different voltage levels.

Detailed Application Field Plans

The PCA9546ADT finds applications in various scenarios where multiple I2C devices need to be connected to a single I2C bus. Some common application fields include:

1. Embedded Systems: The PCA9546ADT is widely used in embedded systems where multiple sensors, actuators, and other peripherals communicate over the I2C bus. It simplifies the design by reducing the number of required I2C interfaces and enables communication between devices operating at different voltage levels.

2. Industrial Automation: In industrial automation systems, the PCA9546ADT allows multiple I2C-based sensors and control modules to share a single I2C bus. This reduces wiring complexity and improves system scalability.

3. Consumer Electronics: The PCA9546ADT is utilized in consumer electronics devices that incorporate multiple I2C devices, such as smartphones, tablets, and smart home devices. It enables efficient communication between various components while minimizing the number of required I2C interfaces.

Detailed and Complete Alternative Models

• PCA954